Technology for cooling the inside of a building lower than the outside air temperature: This technology makes room temperature lower than the outside air temperature through radiative cooling, directly from inside the room. No energy is consumed on the Earth, as it is done using radiative cooling. Our method employs no special equipment or materials, and no running cost is involved. Infrared transmission glass is used for high-side windows through which the sky can be seen.
Japanese Patent No. 6209806

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The purpose of the present invention is to radiate infrared rays from indoors directly to outer space without using energy on the earth to lower the room temperature.

The present invention relates to buildings.
The present invention relates to the transfer of energy between three of the planets receiving light from stars and stars, and the universe with an infinite amount of heat absorption.
The present invention is a structure that only radiates without injecting energy into an enclosed space (building) placed on a planet.

Radiative cooling study from 1993 to the present.
Japanese Patent No. 6209806, Japanese Patent No. 4382870, Japanese Patent No. 4571706, Japanese Patent Application No. 2010-104995, Japanese Patent Application No. 2000-297710, Japanese Patent Application No. 06-091229

Cool the inside of the house 2 or 3 ℃ from the outside temperature.
It is a mechanism to cool by structure only without using energy, water, fan etc. energy.

I tried a simple experiment.
Styrofoam is going to be a miniature house.
I measured the outside temperature and the temperature inside the box.
It is measurement data from 10:30 to 19:20 (sunset).
On the way, there is a part where the indoor temperature exceeds the outside temperature, but this is an experiment mistake.
If you modify it immediately and continue the experiment, the room temperature falls.
When you look at this, you can see that it will cool from 1 to 3 ° C to the outside temperature.



○ 設計条件



○ Design condition

· The temperature of the blue sky is about -17 ° C when measured with a radiation thermometer.
As you gradually lower the angle, if the measured temperature rises and turns straight down, it will be the temperature of the ground.
Just above is coldest and the bottom is the hottest.
– Shield the radiation of heat received from the sun and surrounding objects and use only radiative cooling from the room.
· Looking upward from the floor surface, the larger the area of ​​blue sky, the higher the heat dissipation effect.
I reflect the blue sky with the wall as a mirror.
· If you use a floor plate or a top board of a table that is hard and stores a large amount of heat, the amount of heat dissipation increases.
The board will cool down.
· Even on the northern side vertical windows use heat ray reflection glass even at the north side to take in the far infrared rays from the outdoors and heat the room. Be sure to use heat reflective glass on the south side.
Since the temperature of the far infrared ray absorbing glass rises, reflective glass is used.
· Float glass in the skylight has a higher heat dissipation effect, but it becomes weaker against snow and falling objects, so you have no choice but to angle it. I also angle to the purpose of washing away dirt.

1. The skylight is a pair of glass of float glass.
· When installed horizontally, heat dissipation effect is high.
· The larger the skylight, the higher the heat dissipation effect.


2. Do not put direct sunlight from the skylight. (24 hours)
· Since the summer solstice is June, it is not yet hot, so it may have a structure that does not allow direct sunlight after July.
(Respond flexibly considering construction site etc.)
· Do not put direct sunlight from skylights for 24 hours during high temperature period.



3. Do not make vertical windows on the wall.
· When making, use heat ray reflective glass so that heat wire does not enter from outside. (North side too)
· Use glass with high reflectance as allowed by design.

4. When looking up from the floor the structure which looks like a whole sky becomes the highest efficiency.
· It may be necessary to roll aluminum roll curtain down only on the interior wall surface in the summer. (To be a mirror)






5. There is a method to have a function to adjust the day when direct sunlight enters by attaching a shutter or the like to the outside of the skylight.
· It can be fully closed as it also helps to prevent heat radiation during the winter season. (Structure extending from the bottom)

6. On the materials of the floor and the wall

A hard material that stores a lot of heat is good.
When carpet etc is laid on the floor, it releases less heat on the surface of the carpet.

7. How to radiate with a vertical window

It is possible to emit far-infrared rays obliquely upward although radiation efficiency drops.
The low window glass that incorporates the ambient heat is a heat ray reflection glass to prevent incidence from the outside. Or make it a wall.
It is not necessary to radiate far infrared rays directly above the floor surface.



8. How cool is it?

I experimented to see how cool it is, although it is different from the structure of the house to try.
Even such a device cooled by about 11 ° C. from the outside temperature.
In the near future, there is a possibility that air-conditioner outdoor unit which does not need electric power can be made.



It cooled down 11 ° C from the outside temperature like this. I think that it will cool down around 20 ℃ if made precisely.

Since radiant cooling can not be used on cloudy days, it is possible to cool steadily at any time by cooling it with a compressor for insufficient space, so radiant cooling can be used on blue sky day to reduce energy consumption. For reference, I have drawn a diagram of a hybrid air conditioner combining a compressor and a radiant cooler.



Japanese Patent No. 6209806

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